Free tool · AI
Cold email subject A/B generator
Describe your pitch + audience → get 3 cold email subject variants, each using a different psychological angle: specific number, curiosity, direct value. Then plug into the spam-risk tester for full validation.
Generating subject variants via DeepSeek…
All variants are AI-generated, UK English, 35–55 characters, no spam triggers. Rate-limited to 10 generations/hour per IP. Verify each variant through our spam-risk tester before sending production-scale.
Want the email body + recipient list too?
Borrowsignal delivers 20 UK SME leads/day with director + phone + AI body hook, ready for outreach. £149/mo.
Start free pilot →
Borrowsignal delivers 20 UK SME leads/day with director + phone + AI body hook, ready for outreach. £149/mo.
Start free pilot →